That worked. Many thanks Eryk.
Rob
On 30/06/2022 23:45, Eryk Sun wrote:
On 6/30/22, Rob Cliffe via Python-list <python-list@python.org> wrote:
AKAIK it is not possible to give ctypes a bytearray object and persuade
it to give you a pointer to the actual array data, suitable for passing
to a DLL.
You're overlooking the from_buffer() method. For example:
>>> ba = bytearray(10)
>>> ca = (ctypes.c_char * len(ba)).from_buffer(ba)
>>> ca.value = b'spam&eggs'
>>> ba
bytearray(b'spam&eggs\x00')
Note that the bytearray can't be resized while a view of the data is
exported. For example:
>>> ba.append(97)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
BufferError: Existing exports of data: object cannot be re-sized
>>> del ba[-1]
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
BufferError: Existing exports of data: object cannot be re-sized
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